Multitech MULTIVOIP MVP-810ST Guía de usuario descargar pdf (Pagina 156)

Technical Configuration (T1/E1) MultiVOIP User Guide

156

T1 Parameter Definitions (cont’d)

Field Name Values Description

CAS Protocol E&M Immed Strt

E&M Wink Start

E&M Wink with

dial tone

FXO Ground Strt

FXO Loop Start

FXS Ground Strt

FXS Loop Start

Channel Associated Signaling

(CAS) is a method of

incorporating telephony

signaling info into a T1

voice/data stream. In CAS, the

signaling bits (the A, B, C, and

D bits) are multiplexed into the

signal stream of each T1

channel. (By contrast, in

Common Channel Signaling

(CCS), one channel handles

signaling for all other channels.)

Each CAS protocol defines the

states of the signaling bits

during the various stages of a

call (IDLE, SEIZED, ANSWER,

RING-ON, RING-OFF).

The CAS protocol code allows

the VOIP to interact properly

with the PBX or central-office

switch that it serves. The need

to download CAS protocols

arises for only a small minority

of VOIP users, and only when

PBX/switch is found to be

incompatible with standard

protocols.

Match this parameter to the

setting of PBX or central-office

switch.

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